package com.example.juc.unsafe;

import java.util.*;
import java.util.concurrent.CopyOnWriteArrayList;

// java.util.ConcurrentModificationException
public class ListTest {
    public static void main(String[] args) {

        List<String> list = new CopyOnWriteArrayList<>();

        for (int i =0 ;i<10;i++){
            new Thread(()->{
                list.add(UUID.randomUUID().toString().substring(0,5));
                System.out.println(list);
            },String.valueOf(i)).start();
        }
    }
}
